GTI9100GBootloaderFreedom » History » Revision 2
Revision 1 (Denis 'GNUtoo' Carikli, 03/06/2020 09:56 PM) → Revision 2/56 (Denis 'GNUtoo' Carikli, 03/06/2020 09:59 PM)
h1. I9100GBootloader h2. Unsigned versions TODO h2. Signed versions To get the bootrom to try to boot on USB, you need to do the following: * Connect the USB cable to the device but make sure it's not connected on the computer. * Power off the device * Connect the USB cable If we do that, we get the following in the kernel log of your laptop: <pre> usb 1-1: new high-speed USB device number 24 using ehci-pci usb 1-1: unable to get BOS descriptor or descriptor too short usb 1-1: New USB device found, idVendor=0451, idProduct=d00f, bcdDevice= 0.00 usb 1-1: New USB device strings: Mfr=33, Product=37, SerialNumber=0 usb 1-1: Product: OMAP4430 usb 1-1: Manufacturer: Texas Instruments </pre> We can also try to get a bit more infos with omap-usb-boot: <pre> $ sudo omap-usb-boot -v -w boot invalidbootmedia Finding and opening USB device Found and opened omap4 USB device: OMAP4430 ASIC device id: 4430, HS device Booting from device invalidbootmedia... Booting device invalidbootmedia not found Booting from device failed </pre> Here we know the device is signed because it's a "HS device". If it was not signed it would print "GP device" instead. h2. Source code * https://github.com/hpagseddy/i9100g_xloader This got rebuilt and flashed, and it worked on the device it was tested on. * https://blog.the-leviathan.ch/?p=408 h2. TODO * Understand how to get unsigned versions (Android version, serial number, etc) * Get a device with u-boot and ask samsung for source code